Help with chest voice?

For a singing recital I'm doing, I'm singing the song Breakaway by Kelly Clarkson. I'm having trouble switching from head to chest voice. I can reach all of the notes, but there isn't a good flow, and my chest voice is very soft. I have a private voice instructor, but hey, you can never get enough tips! So, how can I flow between head and chest voice better, and how can I make my chest voice more clear/louder? Any help appreciated~